I'll second that it's not CWM's fault. I had that problem originally where going into CWM would bork my EXT4. After I updated to imoseyon's GB kernel, I didn't have that problem anymore. It appears that while adding voodoo support (as opposed to just EXT4 support), he fixed whatever was causing the kernel to revert two of the partitions back to RFS. I have gone into CWM several times since installing that kernel, and have never had a problem keeping all four partitions at EXT4.
I am using version 2.2.5 because that was the current one when I decided to make the switch, but I think I saw him mention in another thread that 2.0.6 was the first version that should work for everyone.
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